Electric motor



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J. L. THOMA.

ELECTRIC MOTOR- No. 587,769. Patented Aug. 10,1897.

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J. L. THOMA.

ELECTRIC MOTOR Patented Aug. 10,1897.

UNITED STATES PATENT OFFICE.

JULIUS L. THOHA, OF KANSAS CITY, MISSOURI.

ELECTRIC MOTOR.

SPECIFICATION forming part of Letters Patent No. 587,769, dated August 10, 1897.

Application filed August 17, l 896.

tion with inexpe nsiveness of manufacture.

\Vith these general objects in view the invention consists in certain novel and peculiar features of construct-ion and combinations of parts, as will be hereinafter described and claimed.

In order that the invention may be fully understoood, I will proceed to describe it with reference to the accoi'npai'lying drawings, in which- Figure 1 represents a side elevation of an electric motor embodying my invention. Fig. 2 represents a top plan view of the same. Fig. 3 represents a Vertical section taken on the line 00 wof Fig. 4. Fig. 4 represents a plan view partly broken away and sectioned to expose the arrangement of the lield-magnets or coils and the connecting-wires.

Like reference-numerals refer to corresponding parts throughout the several views.

1 designates a cylindrical casing or frame of suitable size and provided internally with a series of lugs or shoulders 2, on which the circular head or plate 3 of the motor rests.

4E designates the vertical shaft of the motor. It is journaled at its lower end, as at 5, in the bottom and center of the casing and also finds a hearing, as at 6, in the top plate 3. Said top plate is provided with a series of holes or openings '7, arranged concentrically around the shaft, and depending therethrough are the pins 8, said pins being engaged at their upper threaded ends by threaded collars or nuts 9. These pins 8 form the cores of the field-coils 10, which encompass said cores, as shown clearly in Figs. 3 and at. One end 11 of each coil extends upwardly through an insulating opening or hole 12 in the top plate 3 Serial No. 603,048. (No model.)

tivel as shown in. Fi 2 so that when one cross-arm is vertically over the poles of two of the magnets or field-coils the other crossarm will be vertically over the space between two other magnets or lieldcoils, and depending from said arms and adapted to pass successively over each pole are the pins 18, which terminate adjacent to the upper end of the poles. Said arms are electrically connected to the collector through the medium of the upper armature and the shaft.

The lower armature is of substantially the same construction and arrangement as the upper, except that it is not provided with the depending pins 18 and studs 19. (See Figs. 1 and 2.) Said studs carry the brushes 20, and they are fixed at the required point by means of the set-screws 21, carried by said studs.

22 designates a bracket which is secured externally to the frame or casing 1 and is provided with the upwardly-proj ectin g standards 23 and 2.4-, (see Fig. 2,) and secured upon said standards by means of the clampingnuts 25 is the inwardly-prejecting arm 26, provided with a depending post 27 at its inner end, which carries a collecting-brush 28 in frictional contact with the collector 15. Said brush is fixed at any required point of adj ust ment by means of the set-screw 29, carried by said post, and through the medium of the setscrew 30 at the upper end of said post the wire or conductor 31, leading to the dynamo or battery, (not shown,) is attached.

32 designates the other wire or conductor, leading from the dynamo or battery into the casing or frame 1 and attached at the inner end to the metallic annulus or ring 33 below the lower armature 16. The opposite ends 11 of the field-coils are also electrically connectcd to said annulus or ring.

In operation the current generated by the dynamo or battery passes through the wire 32, the annulus 33, the field-magnets 10, the commutator 14, the brushes 20, the upper armature 16, the collector 15, the collecting brush 28, post 27, and conductor 31, back to the dynamo or other pole of the battery, so as to complete an electrical circuit. Immediately this circuit is completed the field-coils are energized and create a magnetic field both above and below, and consequently attract and rotate the armatures 16 and through said armatures the shaft&. The rotation at first is slow, but as the armatures cut the magnetic field the rotation becomes extremely rapid and the shaft rotates at a corresponding speed, and consequently imparts motion through the customary belt (not shown) to the machinery to which it may be connected. By employing a plurality of field magnets or coils and a double armature rotating through the magnetic fields it is obvious that the power capacity is increased and that only a small current need be employed to operate the motor. I11 fact, it has been found in practice that a few battery-cells are sufficient to operate the same.

It is to be understood, of course, that slight changes in the detail construction, in the form, or in the arrangement of the parts may be made without departing from the spirit and scope or sacrificing any of the advantages of my invention.

Having thus described the invention, what I claim as new, and desire to secure by Letters Patent, is-

1. An electric motor, comprising a circular easing, a top plate closing the upper end of the same and provided with a series of insulated holes or openings, a shaft journaled in the bottom of the casing and in said top plate, a circular series of field-coils suspended from the top plate within the casing and having their upper ends extending through said insulated. holes or openings, at commutator mounted upon said top plate and surrounding said shaft and provided with a series of pins which are connected to said ends of the fieldcoils, a conducting annulus in the bottom of the casing electrically connected to the opposite ends of said field-coils, a conductor from the source of supply connected to said annulus and extending through the casing, an armature mounted rigidly upon said shaft within the casing and below the field-coils, an armature mounted upon said shaft above the commutator and provided with depending pins having their lower ends contiguous to the upper ends of the field-coils, studs de- 1 pending also from said arn'iatures, brushes carried thereby and engaging the commutator, a collector at the upper side of said armature, and a collecting-brush engaging the same and electrically connected to the source of electrical supply, substantially as described.

2. An electric motor, comprisingacircular casing, a top plate closing the upper end of the same and provided wit-h a series of insulated holes or openings, a shaft journaled in the bottom of the casing and in said top plate, a circular series of field-coils suspended from the top plate within the casing and having their upper ends extending through said insulated holes or openings, a commutator mounted upon said top plate and surrounding said shaft and provided with a series of pins which are connected to said ends of the fieldcoils, a condnoting-annulus in the bottom of the casing electrically connected to the opposite ends of said field-coils, a conductor from the source of electric supply connected to said annulus and extending through the casing, an armature mounted rigidly upon said shaft within the casing and below the field-coils, an armature mounted upon said shaft above the commutator and provided with depending pins having their lower ends contiguous to the upper ends of the field-coils, studs depending also from said armature, brushes adjustably carried thereby and engaging the commutator, a collector at the upper side of the armature, a bracket secured externally to the casing, standards carried thereby, an inwardly-extending arm carried by said standards, a post carried by said arm, an adjustable'brush carried by said post and engaging the collector, and a conductor connecting said post with the source of electric supply, substantially as described.

3. In an electric motor, the combination of a circular casing, a shaft journaled therein, a circular series of field-magnets surrounding the shaft, an armature mounted rigidly upon said shaft, of skeleton form and provided with depending arms relatively arranged so that when two of them are directly over the poles of two of the field coils or magnets two others will be vertically over the space between two other field coils or magnets, a commutator upon the shaft below said armatu re, and above the top plate of the casing, and arms projecting rigidly from said commutator, and connected to said field coils or magnets, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

JULIUS l). TIIOillA.

Witnesses:

MARVIN SoUDDnR, PASQUALE ZIBELTNT. 

